arch/powerpc/include/asm/hw_breakpoint.h

   1 /*
   2  * PowerPC BookIII S hardware breakpoint definitions
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright 2010, IBM Corporation.
  19  * Author: K.Prasad <prasad@linux.vnet.ibm.com>
  20  *
  21  */
  22
  23 #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
  24 #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
  25
  26 #ifdef  __KERNEL__
  27 struct arch_hw_breakpoint {
  28         unsigned long   address;
  29         u16             type;
  30         u16             len; /* length of the target data symbol */
  31 };
  32
  33 /* Note: Don't change the the first 6 bits below as they are in the same order
  34  * as the dabr and dabrx.
  35  */
  36 #define HW_BRK_TYPE_READ                0x01
  37 #define HW_BRK_TYPE_WRITE               0x02
  38 #define HW_BRK_TYPE_TRANSLATE           0x04
  39 #define HW_BRK_TYPE_USER                0x08
  40 #define HW_BRK_TYPE_KERNEL              0x10
  41 #define HW_BRK_TYPE_HYP                 0x20
  42 #define HW_BRK_TYPE_EXTRANEOUS_IRQ      0x80
  43
  44 /* bits that overlap with the bottom 3 bits of the dabr */
  45 #define HW_BRK_TYPE_RDWR        (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
  46 #define HW_BRK_TYPE_DABR        (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
  47 #define HW_BRK_TYPE_PRIV_ALL    (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
  48                                  HW_BRK_TYPE_HYP)
  49
  50 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  51 #include <linux/kdebug.h>
  52 #include <asm/reg.h>
  53 #include <asm/debug.h>
  54
  55 struct perf_event;
  56 struct pmu;
  57 struct perf_sample_data;
  58
  59 #define HW_BREAKPOINT_ALIGN 0x7
  60
  61 extern int hw_breakpoint_slots(int type);
  62 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
  63 extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
  64 extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
  65 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  66                                                 unsigned long val, void *data);
  67 int arch_install_hw_breakpoint(struct perf_event *bp);
  68 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  69 void hw_breakpoint_pmu_read(struct perf_event *bp);
  70 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  71
  72 extern struct pmu perf_ops_bp;
  73 extern void ptrace_triggered(struct perf_event *bp,
  74                         struct perf_sample_data *data, struct pt_regs *regs);
  75 static inline void hw_breakpoint_disable(void)
  76 {
  77         struct arch_hw_breakpoint brk;
  78
  79         brk.address = 0;
  80         brk.type = 0;
  81         brk.len = 0;
  82         __set_breakpoint(&brk);
  83 }
  84 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
  85
  86 #else   /* CONFIG_HAVE_HW_BREAKPOINT */
  87 static inline void hw_breakpoint_disable(void) { }
  88 static inline void thread_change_pc(struct task_struct *tsk,
  89                                         struct pt_regs *regs) { }
  90 #endif  /* CONFIG_HAVE_HW_BREAKPOINT */
  91 #endif  /* __KERNEL__ */
  92 #endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */